Page 1 : 14:44 | 0.0KB/s ms,, , € ~~ ch14.pdf n,, , NCERT Solutions for Class 8 Science Chapter 14, , Chemical Effects of Electric Current, , Exercise: Solutions of Questions on Page Number 180, at:, , Fill in the blanks., , , , (a) Most liquids that conduct electricity are solutions of and, (b) The passage of an electric current through a solution causes effects., , (©) If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the,, terminal of the battery., , (d) The process of depositing a layer of any de is called., , , , -d metal on another material by means of electri, , , , Answer :, (2) Most liquids that conduct electricity are solutions of __acids , _bases _ and __salts, , (The solutions of acids, bases or salts are conducting in nature. They allow the current to pass through.) (b), , ‘The passage of an electric current through a solution causes __chemical__ effects., , (When an electric current passes through a solution, the solution decomposes into its positive and negative ions. This process of, decomposition of the solution is a chemical effect.), , (0) If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the_negative _ terminal, of the battery., , (When an electric current passes through a copper sulphate solution, the solution decomposes into positively charged copper ions, and negatively charged sulphate ions. These positively charged copper ions get attracted towards the plate which is connected to, the negative terminal of a battery.), , (d) The process of depositing a layer of any desired metal on another material by means of electricity is called__electroplating, , Q2:, , When the free ends of a tester are dipped into a solution, the magnetic needle shows deflection. Can you explain the, reason?, , Answer :, , ‘The deflection in the compass needle shows that current is flowing through the wounded wire and hence, through the circuit. The, circuit is complete since free ends of the tester are dipped in a solution. The solution is certainly a conducting solution. This is the, reason why the compass needle shows a deflection., , Qs:, , Name three liquids, which when tested in the manner shown in Fig. 14.9, may cause the magnetic needle to deflect., , , , Fig. 14.9, , Answer :, , Liquids like lemon juice, salt water and vegetable oil allow electricity to pass through them. Hence, these liquids can be used as in, the beaker to show the given effect., , = 0, , ‘The bulb does not glow in the setup shown in Fig. 14.10. List the possible reasons. Explain your answer.